Nolan Boiler & Tank Service Inc. has a state of the art quality control system which includes the proper designation of responsibility, material handling, inspection and other stringent quality control measures. Our welders are certified and able to perform their duties in a professional manner using this system. We maintain a constant record of expertise in Code repairs of boilers and pressure vessels. We are certified experts and offer repairs on all brands of boilers and pressure vessels. We have one of the best reputations in the Chicago area.